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k in (-oo:+oo)
5*k-10 = 71-4*k // - 71-4*k
5*k-(-4*k)-71-10 = 0
5*k+4*k-71-10 = 0
9*k-81 = 0 // + 81
9*k = 81 // : 9
k = 81/9
k = 9
k = 9
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